package com.isoft.game.common.util;


import com.alibaba.druid.util.Base64;
import com.alibaba.druid.util.JdbcUtils;

import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.security.*;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * 
 * @ProjectName:family
 * @Description: 加密、解密数据库密码执行类
 * @Copyright: Copyright (c) 2016
 * @author: cy
 * @date 2016年5月22日
 */
public class DecryptDBPasswordUtility {
	private static final String DEFAULT_PRIVATE_KEY_STRING = "MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAocbCrurZGbC5GArEHKlAfDSZi7gFBnd4yxOt0rwTqKBFzGyhtQLu5PRKjEiOXVa95aeIIBJ6OhC2f8FjqFUpawIDAQABAkAPejKaBYHrwUqUEEOe8lpnB6lBAsQIUFnQI/vXU4MV+MhIzW0BLVZCiarIQqUXeOhThVWXKFt8GxCykrrUsQ6BAiEA4vMVxEHBovz1di3aozzFvSMdsjTcYRRo82hS5Ru2/OECIQC2fAPoXixVTVY7bNMeuxCP4954ZkXp7fEPDINCjcQDywIgcc8XLkkPcs3Jxk7uYofaXaPbg39wuJpEmzPIxi3k0OECIGubmdpOnin3HuCP/bbjbJLNNoUdGiEmFL5hDI4UdwAdAiEAtcAwbm08bKN7pwwvyqaCBC//VnEWaq39DCzxr+Z2EIk=";
	public static final String DEFAULT_PUBLIC_KEY_STRING = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKHGwq7q2RmwuRgKxBypQHw0mYu4BQZ3eMsTrdK8E6igRcxsobUC7uT0SoxIjl1WveWniCASejoQtn/BY6hVKWsCAwEAAQ==";

	public static void main(String[] args) throws Exception {
		String password = "";
		String decryptPassword= "bNVOqb7WKLX5Bjnw+LMv92taj25KOxDimXxILPQjw42wgv+1lHzOH8kr97xDwWdhpY67QuYCS7sWN4W46YbkFA==";
//		String[] arr = genKeyPair(512);
//		System.out.println("privateKey:" + arr[0]);
//		System.out.println("publicKey:" + arr[1]);
		System.out.println("encrypt-password:" + encrypt(DEFAULT_PRIVATE_KEY_STRING, "itoffice"));
		System.out.println("decrypt-password:" + decrypt(DEFAULT_PUBLIC_KEY_STRING,decryptPassword));
	}

	public static String decrypt(String cipherText) throws Exception {
		return decrypt((String) null, cipherText);
	}

	public static String decrypt(String publicKeyText, String cipherText) throws Exception {
		PublicKey publicKey = getPublicKey(publicKeyText);

		return decrypt(publicKey, cipherText);
	}

	public static PublicKey getPublicKeyByX509(String x509File) {
		if ((x509File == null) || (x509File.length() == 0)) {
			return getPublicKey(null);
		}
		FileInputStream in = null;
		try {
			in = new FileInputStream(x509File);

			CertificateFactory factory = CertificateFactory.getInstance("X.509");

			Certificate cer = factory.generateCertificate(in);
			return cer.getPublicKey();
		} catch (Exception e) {
			throw new IllegalArgumentException("Failed to get public key", e);
		} finally {
			JdbcUtils.close(in);
		}
	}

	public static PublicKey getPublicKey(String publicKeyText) {
		if ((publicKeyText == null) || (publicKeyText.length() == 0)) {
			publicKeyText = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKHGwq7q2RmwuRgKxBypQHw0mYu4BQZ3eMsTrdK8E6igRcxsobUC7uT0SoxIjl1WveWniCASejoQtn/BY6hVKWsCAwEAAQ==";
		}
		try {
			byte[] publicKeyBytes = Base64.base64ToByteArray(publicKeyText);
			X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKeyBytes);

			KeyFactory keyFactory = KeyFactory.getInstance("RSA");
			return keyFactory.generatePublic(x509KeySpec);
		} catch (Exception e) {
			throw new IllegalArgumentException("Failed to get public key", e);
		}
	}

	public static PublicKey getPublicKeyByPublicKeyFile(String publicKeyFile) {
		if ((publicKeyFile == null) || (publicKeyFile.length() == 0)) {
			return getPublicKey(null);
		}
		FileInputStream in = null;
		try {
			in = new FileInputStream(publicKeyFile);
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			int len = 0;
			byte[] b = new byte[64];
			while ((len = in.read(b)) != -1) {
				out.write(b, 0, len);
			}
			byte[] publicKeyBytes = out.toByteArray();
			X509EncodedKeySpec spec = new X509EncodedKeySpec(publicKeyBytes);
			KeyFactory factory = KeyFactory.getInstance("RSA");
			return factory.generatePublic(spec);
		} catch (Exception e) {
			throw new IllegalArgumentException("Failed to get public key", e);
		} finally {
			JdbcUtils.close(in);
		}
	}

	public static String decrypt(PublicKey publicKey, String cipherText) throws Exception {
		Cipher cipher = Cipher.getInstance("RSA");
		try {
			cipher.init(2, publicKey);
		} catch (InvalidKeyException e) {
			RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey;
			RSAPrivateKeySpec spec = new RSAPrivateKeySpec(rsaPublicKey.getModulus(), rsaPublicKey.getPublicExponent());
			Key fakePrivateKey = KeyFactory.getInstance("RSA").generatePrivate(spec);
			cipher = Cipher.getInstance("RSA");
			cipher.init(2, fakePrivateKey);
		}
		if ((cipherText == null) || (cipherText.length() == 0)) {
			return cipherText;
		}
		byte[] cipherBytes = Base64.base64ToByteArray(cipherText);
		byte[] plainBytes = cipher.doFinal(cipherBytes);

		return new String(plainBytes);
	}

	public static String encrypt(String plainText) throws Exception {
		return encrypt((String) null, plainText);
	}

	public static String encrypt(String key, String plainText) throws Exception {
		if (key == null) {
			key = "MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAocbCrurZGbC5GArEHKlAfDSZi7gFBnd4yxOt0rwTqKBFzGyhtQLu5PRKjEiOXVa95aeIIBJ6OhC2f8FjqFUpawIDAQABAkAPejKaBYHrwUqUEEOe8lpnB6lBAsQIUFnQI/vXU4MV+MhIzW0BLVZCiarIQqUXeOhThVWXKFt8GxCykrrUsQ6BAiEA4vMVxEHBovz1di3aozzFvSMdsjTcYRRo82hS5Ru2/OECIQC2fAPoXixVTVY7bNMeuxCP4954ZkXp7fEPDINCjcQDywIgcc8XLkkPcs3Jxk7uYofaXaPbg39wuJpEmzPIxi3k0OECIGubmdpOnin3HuCP/bbjbJLNNoUdGiEmFL5hDI4UdwAdAiEAtcAwbm08bKN7pwwvyqaCBC//VnEWaq39DCzxr+Z2EIk=";
		}
		byte[] keyBytes = Base64.base64ToByteArray(key);
		return encrypt(keyBytes, plainText);
	}

	public static String encrypt(byte[] keyBytes, String plainText) throws Exception {
		PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory factory = KeyFactory.getInstance("RSA");
		PrivateKey privateKey = factory.generatePrivate(spec);
		Cipher cipher = Cipher.getInstance("RSA");
		try {
			cipher.init(1, privateKey);
		} catch (InvalidKeyException e) {
			RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) privateKey;
			RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(rsaPrivateKey.getModulus(),
					rsaPrivateKey.getPrivateExponent());
			Key fakePublicKey = KeyFactory.getInstance("RSA").generatePublic(publicKeySpec);
			cipher = Cipher.getInstance("RSA");
			cipher.init(1, fakePublicKey);
		}
		byte[] encryptedBytes = cipher.doFinal(plainText.getBytes("UTF-8"));
		String encryptedString = Base64.byteArrayToBase64(encryptedBytes);

		return encryptedString;
	}

	public static byte[][] genKeyPairBytes(int keySize) throws NoSuchAlgorithmException {
		byte[][] keyPairBytes = new byte[2][];

		KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");
		gen.initialize(keySize, new SecureRandom());
		KeyPair pair = gen.generateKeyPair();

		keyPairBytes[0] = pair.getPrivate().getEncoded();
		keyPairBytes[1] = pair.getPublic().getEncoded();

		return keyPairBytes;
	}

	public static String[] genKeyPair(int keySize) throws NoSuchAlgorithmException {
		byte[][] keyPairBytes = genKeyPairBytes(keySize);
		String[] keyPairs = new String[2];

		keyPairs[0] = Base64.byteArrayToBase64(keyPairBytes[0]);
		keyPairs[1] = Base64.byteArrayToBase64(keyPairBytes[1]);

		return keyPairs;
	}
	

}
